Disease-related

Disease-related malnutrition can be considered in four categories

 problems of weight loss associated with specific diseases are:

•     As advanced chronic pulmonary disease (COPD) obstructive pulmonary disease, approximately 35% of patients suffer severe weight loss called cachexia lung, including a decrease in muscle mass. About 25% experience moderate to severe weight loss, and most others have some weight loss. Top weight loss is associated with a poor prognosis. Theories of contributing factors include loss of appetite associated with reduced activity, the additional energy required for breathing, and difficulty eating with dyspnea (difficulty breathing).

•     Cancer, a very common cause and unexplained weight loss sometimes fatal (idiopathic). Approximately one third of cases of unintentional weight loss are secondary to malignancy. Cancers to suspect in patients with unexplained weight loss include gastrointestinal, prostate, hepatobillary (hepatocellular carcinoma, pancreatic cancer), ovarian, hematologic malignancies or lung.

•     AIDS can cause weight loss and should be suspected in high-risk individuals who have weight loss.

•     Gastrointestinal disorders are another common cause of weight loss for no apparent reason - in fact, are the most common weight loss idiopathic non-malignant. Possible gastrointestinal etiologies of unexplained weight loss are celiac disease, peptic ulcer, inflammatory bowel disease (Crohn's disease and ulcerative colitis), pancreatitis, gastritis, diarrhea and other disorders gastrointestinal can cause weight loss.

•     Infections. Some infectious diseases can cause weight loss. These include fungal illness, endocarditis, many parasitic diseases, AIDS, and other sub-acute or latent infections can cause weight loss.

•     Kidney disease. Patients with uremia often have poor or absent appetite, vomiting and nausea. This can lead to weight loss.

•     Heart disease. Cardiovascular disease, especially congestive heart failure, can cause unexplained weight loss failure.

•     Connective tissue disease

•     Neurological diseases such as dementia

•     Stress can cause weight loss. However, recent research (Jastebott, Potenza et al. 2010) shows a correlation between obesity and high stress